*::after, *::before {
  box-sizing: border-box;
}

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #202020;
}

.container {
  position: absolute;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.container.circle .block {
  border-radius: 50%;
}

.container .block {
  position: absolute;
  width: 50px;
  height: 50px;
  background: #444;
  box-shadow: 10px 10px 30px rgba(0,0,0,.5);
}

.container .block:nth-child(3n + 1) {
  background: #444;
}

.container .block:nth-child(3n + 2) {
  background: #FFF;
}

.container .block:nth-child(3n + 3) {
  background: #03a9f4;
}

.container button {
  position: relative;
  z-index: 1;
  margin: 10px;
  border: none;
  background: #FFF;
  font-size: 1.2em;
  cursor: pointer;
  padding: 15px 30px;
  box-sizing: 10px 10px 30px rgba(0,0,0,.25);
}